Such as irrigation. Water retention dam used for agriculture. This is because the properties in natural water contains contaminants are inorganic salts, especially. Chloride salts. While the use of water for agriculture, water will evaporate into steam by the natural salt. Volatile inorganic compounds, which will be held in the soil. When there is an accumulation of salt in the soil into much higher. Salted soil is not suitable for cultivation. Inorganic salt residue may be Washout. Later by rain or irrigation drainage Inorganic salts are relayed down to the River in the end.